content: /*
   * Protocol Buffers - Google's data interchange format
   * Copyright 2014 Google Inc.  All rights reserved.
   * https://developers.google.com/protocol-buffers/
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package com.google.protobuf.jruby;
  
  import com.google.protobuf.DescriptorProtos;
  import com.google.protobuf.Descriptors;
  import org.jruby.*;
  import org.jruby.anno.JRubyClass;
  import org.jruby.anno.JRubyMethod;
  import org.jruby.runtime.Block;
  import org.jruby.runtime.ObjectAllocator;
  import org.jruby.runtime.ThreadContext;
  import org.jruby.runtime.builtin.IRubyObject;
  
  import java.util.HashMap;
  import java.util.Map;
  
  
  @JRubyClass(name = "Descriptor", include = "Enumerable")
  public class RubyDescriptor extends RubyObject {
      public static void createRubyDescriptor(Ruby runtime) {
          RubyModule protobuf = runtime.getClassFromPath("Google::Protobuf");
          RubyClass cDescriptor = protobuf.defineClassUnder("Descriptor", runtime.getObject(), new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyDescriptor(runtime, klazz);
              }
          });
          cDescriptor.includeModule(runtime.getEnumerable());
          cDescriptor.defineAnnotatedMethods(RubyDescriptor.class);
      }
  
      public RubyDescriptor(Ruby runtime, RubyClass klazz) {
          super(runtime, klazz);
      }
  
      /*
       * call-seq:
       *     Descriptor.new => descriptor
       *
       * Creates a new, empty, message type descriptor. At a minimum, its name must be
       * set before it is added to a pool. It cannot be used to create messages until
       * it is added to a pool, after which it becomes immutable (as part of a
       * finalization process).
       */
      @JRubyMethod
      public IRubyObject initialize(ThreadContext context) {
          this.builder = DescriptorProtos.DescriptorProto.newBuilder();
          this.fieldDefMap = new HashMap<String, RubyFieldDescriptor>();
          this.oneofDefs = new HashMap<IRubyObject, RubyOneofDescriptor>();
          return this;
      }
  
      /*
       * call-seq:
       *     Descriptor.name => name
       *
       * Returns the name of this message type as a fully-qualfied string (e.g.,
       * My.Package.MessageType).
       */
      @JRubyMethod(name = "name")
      public IRubyObject getName(ThreadContext context) {
          return this.name;
      }
  
      /*
       * call-seq:
       *    Descriptor.name = name
       *
       * Assigns a name to this message type. The descriptor must not have been added
       * to a pool yet.
       */
      @JRubyMethod(name = "name=")
      public IRubyObject setName(ThreadContext context, IRubyObject name) {
          this.name = name;
          this.builder.setName(Utils.escapeIdentifier(this.name.asJavaString()));
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.add_field(field) => nil
       *
       * Adds the given FieldDescriptor to this message type. The descriptor must not
       * have been added to a pool yet. Raises an exception if a field with the same
       * name or number already exists. Sub-type references (e.g. for fields of type
       * message) are not resolved at this point.
       */
      @JRubyMethod(name = "add_field")
      public IRubyObject addField(ThreadContext context, IRubyObject obj) {
          RubyFieldDescriptor fieldDef = (RubyFieldDescriptor) obj;
          this.fieldDefMap.put(fieldDef.getName(context).asJavaString(), fieldDef);
          this.builder.addField(fieldDef.build());
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.lookup(name) => FieldDescriptor
       *
       * Returns the field descriptor for the field with the given name, if present,
       * or nil if none.
       */
      @JRubyMethod
      public IRubyObject lookup(ThreadContext context, IRubyObject fieldName) {
          return this.fieldDefMap.get(fieldName.asJavaString());
      }
  
      /*
       * call-seq:
       *     Descriptor.msgclass => message_klass
       *
       * Returns the Ruby class created for this message type. Valid only once the
       * message type has been added to a pool.
       */
      @JRubyMethod
      public IRubyObject msgclass(ThreadContext context) {
          if (this.klazz == null) {
              this.klazz = buildClassFromDescriptor(context);
          }
          return this.klazz;
      }
  
      /*
       * call-seq:
       *     Descriptor.each(&block)
       *
       * Iterates over fields in this message type, yielding to the block on each one.
       */
      @JRubyMethod
      public IRubyObject each(ThreadContext context, Block block) {
          for (Map.Entry<String, RubyFieldDescriptor> entry : fieldDefMap.entrySet()) {
              block.yield(context, entry.getValue());
          }
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.add_oneof(oneof) => nil
       *
       * Adds the given OneofDescriptor to this message type. This descriptor must not
       * have been added to a pool yet. Raises an exception if a oneof with the same
       * name already exists, or if any of the oneof's fields' names or numbers
       * conflict with an existing field in this message type. All fields in the oneof
       * are added to the message descriptor. Sub-type references (e.g. for fields of
       * type message) are not resolved at this point.
       */
      @JRubyMethod(name = "add_oneof")
      public IRubyObject addOneof(ThreadContext context, IRubyObject obj) {
          RubyOneofDescriptor def = (RubyOneofDescriptor) obj;
          builder.addOneofDecl(def.build(builder.getOneofDeclCount()));
          for (RubyFieldDescriptor fieldDescriptor : def.getFields()) {
              addField(context, fieldDescriptor);
          }
          oneofDefs.put(def.getName(context), def);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.each_oneof(&block) => nil
       *
       * Invokes the given block for each oneof in this message type, passing the
       * corresponding OneofDescriptor.
       */
      @JRubyMethod(name = "each_oneof")
      public IRubyObject eachOneof(ThreadContext context, Block block) {
          for (RubyOneofDescriptor oneofDescriptor : oneofDefs.values()) {
              block.yieldSpecific(context, oneofDescriptor);
          }
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     Descriptor.lookup_oneof(name) => OneofDescriptor
       *
       * Returns the oneof descriptor for the oneof with the given name, if present,
       * or nil if none.
       */
      @JRubyMethod(name = "lookup_oneof")
      public IRubyObject lookupOneof(ThreadContext context, IRubyObject name) {
          if (name instanceof RubySymbol) {
              name = ((RubySymbol) name).id2name();
          }
          return oneofDefs.containsKey(name) ? oneofDefs.get(name) : context.runtime.getNil();
      }
  
      public void setDescriptor(Descriptors.Descriptor descriptor) {
          this.descriptor = descriptor;
      }
  
      public Descriptors.Descriptor getDescriptor() {
          return this.descriptor;
      }
  
      public DescriptorProtos.DescriptorProto.Builder getBuilder() {
          return builder;
      }
  
      public void setMapEntry(boolean isMapEntry) {
          this.builder.setOptions(DescriptorProtos.MessageOptions.newBuilder().setMapEntry(isMapEntry));
      }
  
      private RubyModule buildClassFromDescriptor(ThreadContext context) {
          Ruby runtime = context.runtime;
  
          ObjectAllocator allocator = new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyMessage(runtime, klazz, descriptor);
              }
          };
  
          // rb_define_class_id
          RubyClass klass = RubyClass.newClass(runtime, runtime.getObject());
          klass.setAllocator(allocator);
          klass.makeMetaClass(runtime.getObject().getMetaClass());
          klass.inherit(runtime.getObject());
          RubyModule messageExts = runtime.getClassFromPath("Google::Protobuf::MessageExts");
          klass.include(new IRubyObject[] {messageExts});
          klass.instance_variable_set(runtime.newString(Utils.DESCRIPTOR_INSTANCE_VAR), this);
          klass.defineAnnotatedMethods(RubyMessage.class);
          return klass;
      }
  
      protected RubyFieldDescriptor lookup(String fieldName) {
          return fieldDefMap.get(Utils.unescapeIdentifier(fieldName));
      }
  
      private IRubyObject name;
      private RubyModule klazz;
  
      private DescriptorProtos.DescriptorProto.Builder builder;
      private Descriptors.Descriptor descriptor;
      private Map<String, RubyFieldDescriptor> fieldDefMap;
      private Map<IRubyObject, RubyOneofDescriptor> oneofDefs;
  }
  